121 Maintenance Section Fuel System Secondary Filter Number Two - Replace i01559538 Fuel System Secondary Filter Number Two - Replace SMCS Code: 1261-510-SE S/N: 5SK743-Up Personal injury or death can result from a fire. Fuel leaked or spilled onto hot surfaces or electri- cal components can cause a fire. g00810175 Illustration 198 Clean up all leaked or spilled fuel. Do not smoke while working on the fuel system. 1. To drain upper filter (2) (inverted filter), place a suitable container under the drain valves and open drain valve (3). Then, immediately open drain valve (4) and allow the fuel to drain into the suitable container.
Turn the disconnect switch OFF or disconnect the battery when changing fuel filters. NOTICE Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, test- ing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before open- ing any compartment or disassembling any compo- nent containing fluids. When the fuel stops draining, keep the drain valves open and loosen the inverted filter by a 1/4 turn. As the filter is loosened, additional fuel may drain from the drain valves. Keep turning the filter by 1/4 turns until fuel does not drain from the drain valves.
Then, close the drain valves and properly dispose of the fuel. Note: Make sure that the drain valves are opened in the proper order. If you open the wrong drain valve first, an air lock in the fuel system may occur. This will not allow fuel to drain from the upper filter. Refer to Special Publication, NENG2500, “Caterpillar Tools and Shop Products Guide” for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. 2. Remove upper filter (2). 3. Inspect the fuel filter element for debris by cutting the filter open. Dispose of the used fuel filter element properly.
NOTICE Do not fill fuel filters with fuel before installing them. Contaminated fuel will cause accelerated wear to fuel system parts. 4. Clean the filter mounting base. Make sure that all of the used seal is removed from the filter mounting base. Open the engine access door. The secondary fuel filter is located on the right side of the machine. Note: This machine is equipped with two secondary spin-on filters on a single filter base. The upper filter is upside-down. Always drain the inverted filter before you remove either filter. g00101318 Illustration 199